Question 1

Which of the following best describes why protists are considered a 'junk drawer' group in biology?

Accepted Answer

They are eukaryotes that do not fit into the kingdoms of plants, animals, or fungi, and include multiple unrelated lineages.

Question 2

Which of the following protists is an example of a mixotroph, capable of both photosynthesis and heterotrophy depending on environmental conditions?

Accepted Answer

Euglena

Question 3

A scientist discovers a unicellular organism in a pond that moves by extending pseudopods and engulfs food particles. Which group does this organism most likely belong to?

Accepted Answer

Amoebas

Question 4

Which of the following is a real-world application of diatoms, a type of protist?

Accepted Answer

Used as a filtering medium and in toothpaste as a polishing agent

Question 5

A patient presents with severe diarrhea after drinking untreated stream water. Which protist is most likely responsible, and what is the recommended prevention?

Accepted Answer

Giardia intestinalis; boil water before drinking

Question 6

Which of the following best explains why brown algae (kelp) is not classified as a plant?

Accepted Answer

It lacks true roots, stems, and leaves, and is more closely related to other protists.

Question 7

Which of the following statements about protist locomotion is correct?

Accepted Answer

Some protists move by cytoplasmic streaming into pseudopods.

Question 8

Which protist is responsible for causing malaria, and how is it transmitted?

Accepted Answer

Plasmodium; transmitted by mosquitoes

Question 9

Which of the following best describes the ecological role of photosynthetic protists in aquatic environments?

Accepted Answer

They are the base of many aquatic food chains, supporting higher trophic levels.

Question 10

Which of the following is a correct statement about the evolutionary relationship between protists and animals?

Accepted Answer

Choanoflagellates are the closest living protist relatives to animals.

Question 11

A researcher is developing biofuels using a protist that stores energy as lipid droplets. Which group is most likely being used?

Accepted Answer

Diatoms

Question 12

Which of the following protists is commonly used to wrap sushi and is also a source of agar for microbiology labs?

Accepted Answer

Red algae

Question 13

Which of the following best describes the process of conjugation in protists?

Accepted Answer

The exchange of genetic material between two protists, increasing genetic diversity.

Question 14

Which protist is a parasite that causes sleeping sickness and is transmitted by the tsetse fly?

Accepted Answer

Trypanosoma

Question 15

Which of the following is a characteristic of slime molds that distinguishes them from other protists?

Accepted Answer

They form a multinucleate mass of cytoplasm undivided by plasma membranes.

Question 16

Which of the following protists is most likely to be found as an endosymbiont in the gut of termites, aiding in the digestion of cellulose?

Accepted Answer

Amoeboid protists

Question 17

Which of the following best explains why dinoflagellates can be harmful to humans?

Accepted Answer

They produce toxins that accumulate in shellfish, causing illness when consumed by humans.

Question 18

Which of the following is a correct statement about the alternation of generations in protists?

Accepted Answer

It is a complex sexual life cycle involving both haploid and diploid multicellular stages.

Question 19

Which of the following protists is responsible for causing amoebic dysentery, and what is a key symptom?

Accepted Answer

Entamoeba histolytica; severe diarrhea with blood and mucus in feces

Question 20

Which of the following best describes the role of carrageenan produced by red algae?

Accepted Answer

It is used to stabilize products like ice cream and chocolate milk.

Protists: Diversity, Structure, Function, and Importance

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